Original Publication Date: 1977-Oct-31
Included in the Prior Art Database: 2004-Mar-30
Xerox Disclosure Journal
An arrangement for developing electrostatic images on a photo-conductive imaging surface 2 of an electrostatic machine including a sump or reservoir 3 in which a supply of toner marking particles 4 is maintained. The toner 4 in the reser-voir is delivered by gravity to a open-cel1 foam donor roll 5 which is mounted for rotation on a shaft adjacent an applica-tor or development roll 7. The development roll is made of non-magnetic material and has housed within it permanent magnets 10 and 11, the surface of the roll 7 being coated with a suitable layer of magnetic carrier particles.